November 2002
Intermediate to advanced
432 pages
9h 20m
English
Content preview from Essential .NET, Volume 1: The Common Language RuntimeBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Equivalence Versus Identity
The CLR (like many other technologies) distinguishes between object equivalence and identity. This is especially important for reference types such as classes. In general, two objects are equivalent if they are instances of the same type and if each of the fields in one object matches the values of the fields in the other object. That does not mean that they are “the same object” but only that the two objects have the same values. In contrast, two objects are identical if they share an address in memory. Practically speaking, two references are identical if they refer to the same object.
Comparing object references for identity is trivial, requiring only a comparison of memory addresses, independent of type. One can ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.